As Microsoft removed the file rootsupd.exe from their Download-Center, wsusou isn't able to automatically download it from there. This results in the file being delted and an integrity error thrown the next run. If you still have a copy of rootsupd.exe inside .\client\win\glb please create a backup outside the wsusou-directory, else you are able to download an older version using http://download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/rootsupd.exe (source: http://trac.wsusoffline.net/browser/tru ... xt?rev=661). This file will be downloaded by wsusou instead. To temporarily bypass the integrity/signature error, please disable the checkbox "Verify downloaded updates" in UpdateGenerator and delete the content of .\client\md.